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		<a href="1.html" target="_blank">练习1：用getTime计算你活了多少天</a><br />
		<a href="2.html" target="_blank">练习2：用clearInterval抽奖</a><br />
		<a href="3.html" target="_blank">练习3：用clearInterval人物头像切换</a><br />
		<a href="4.html" target="_blank">练习4：用getTime设置倒计时</a><br />
		<a href="5.html" target="_blank">练习5：用getTime设置计时器</a><br />
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